Fuse-tester.



H. A. BREMER, JR. FUSE TESTER.

APPLICATION FILED JUNE 18, I914. 1,175,335.

Patented Mar. 14, 1916.

-f 2L v JV 5 mm MM fizz/"11y Bremen Jr, 351 his (l wow 's% M HARRY A. BREMER, an, or JERSEY CITY, NEW JERSEY.

FUSE-TESTER.

Specification of Letters Patent.

Patented Mar. 14, 1916.

Application filed June 18, 1914. Serial No. 845,766.

*make and use the same.

This invention relates to fuse testers, and the object thereof is to provide an improved device of this class which is simple in construction and operation and by means of which fuse of different kinds and classes may be quickly, easily and effectually tested.

The invention is fully disclosed in the following specification, of which the accompanying drawing forms apart, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which Figure 1 is a plan view of my improved fuse tester; Fig. 2 a partial longitudinal section on the line 2-2 of Fig. 1; Fig. 3 a partial section on the line 3-3 of Fig. l; and, Fig. a a back diagrammatic view of the tester and showing the electric circuit.

In the practice of my invention, as shown inthe drawing, 1 provide a slab a of any suitable insulating material such as porcelain, hard rubber or the like, and across one end portion of which is a raised member a to which is secured by means of a screw or bolt 6 an L-shaped contact piece 0 which extends downwardly in the direction of the slab a, and another L-shaped contact piece at is secured to the slab a under the transverse member a by a screw or bolt 0Z which passes through said slab and is provided with a countersunk head or nut (Z and which serves as a binding post for a circuit wire 6. The opposite end of the slab a is provided with two transversely arranged socket members f and 9, one of which is adapted to receive an electric light bulb f and the other a fuse plug g and in the bottom of the socket g is a plate 9 having a forwardly directed arm 9 through which is passed a screw or bolt 9 which serves as a binding post and with the top of which is connected a circuit wire 6 and with the lower end of which the circuit wire 6 is connected, and another screw or bolt 9 is passed downwardly through the bottom of the socket g, the plate 9 and the slab a, and

the lower end of which serves as a binding post for an electric circuit wire 6 A plate f similar to the plate 9 is placed in the bottom of the socket f and provided with a forwardly directed arm- 7 and a binding post or screw is passed downwardly through said arm into or through the slab a and with the upper end-0f which is connected a circuit wire a The slab a is provided centrally thereof, in the form of construction shown, with a longitudinal groove a and at the front end thereof and between the sockets f and g a screw or bolt his passed through the slab a and the upper end thereof is provided with a knob or head k in which is mounted a longitudinally movable rod 71, provided at its outer end with a handle 71, and the inner end of which is preferably provided with a head 7?, and mounted on said rod between the head 7L5 and the knob or head if of the screw or bolt his a spiral spring h which normally serves to force said rod inwardly. The screw or bolt It serves as a binding post and the circuit wire 6 is connected with the lower end thereof and another. circuit wire 6 is connect-ed therewith and with a binding post or screw 7 passed downwardly through the bottom of the socket f and slab a.

The wires 6 and er are connected with a battery 71, or other source of electricity, and;

in order to test an ordinary fuse such as that shown at j the procedure is an follows: In the position of the parts shown in Fig. 1, the tension of the spiral spring h is such that the head 72, of the rod h will bear on the contact piece 0 but not to such an extent as to complete the connection between the contact pieces 0 and d, and after a good lamp has been placed in the socket f, the rod h is driven out as shown in Fig. 2, and the plug j is placed in position, after which the said rod 725 is released and the spiral spring it will force the head 71 against the fuse j and due to the increased tension of the spring it the fuse j will complete the connection between the contacts 0 and d, and if the said fuse is good the lamp will be illuminated. In the testing of fuse plugs, the rod 71? remains in the position shown in Fig. 1 and a good lamp is placed in the socket f and by screwing a fuse plug similar to that shown at g in Fig. 3 in the socket g, 1t is possible to determine, whether or not, the said fuse plug is good. If a good fuse be placed in the socket g, it will be also possible to test lamps by reversing the above operation, and lamps may also be tested without using a fuse plug, and this operation consists simply in placing the lamp in a socket 7 and applying sutlicient force to the rod [L3 to complete the connection between the contacts 0 and (Z. The above tests will be found to be correct by tracing the circuits through the wires 6, 0 c, 6* and e which are clearly shown in Fig. 4:.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a fuse tester of the class described, a base slab of insulating material, two contact devices adapted to be brought to ether by pressure applied to one of them and a movable conductor mounted on said slab and between which and said contact devices a cartridge fuse to be tested is adapted to be placed, a socket adapted to receive an electrical lamp bulb, said parts being in an electric circuit adapted to be closed by said devices and pressure applied to said movable conductor, said lamp bulb indicating the condition of said fuse.

2. In a fuse tester of the class described, a base slab of insulating material, two contact devices adapted to be brought together by pressure applied to one of them, a movable conductor mounted on said slab and between which and said contact devices a cartridge fuse to be tested is adapted to be placed, said parts being in an electric circuit adapted to be closed by said devices, and pressure applied to said movable conductor. and means in. said electric circuit for indicating the condition of said fuse.

8. A fuse tester, comprising a base slab of insulating material provided at one end with contact devices adapted to be brought together by pressure applied to one of them, said slab being provided centrally and longitudinally thereof and in front of said contact devices with a longitudinally movable spring operated conductor, adapted to operate in connection with said contact devices, and said slab being also provided at the end thereof opposite said contact devices with two transversely arranged sockets one of which is adapted to receive an electric lamp bulb and the other a fuse plug, said lamp bulb socket and said contact devices being in an electric circuit adapted to be opened and closed by the longitudinal movement of the spring operated conductor, said lamp socket and. said plug socket being connected in series.

a. In a fuse tester of the class described, a base slab of insulating material provided at one end with two contact devices adapted to be brought together by pressure applied to one of them and a spring operated conductor mounted longitudinally of said slab in front of said contact devices and movable longitudinally of said slab and between which and said contact devices the cartridge fuse to be tested is placed, all of said parts being in electric circuit adapted to be opened and closed by the longitudinal move ment of the spring operated conductor, and means in said electric circuit for indicating the condition of said fuse.

In testimony that I claim the foregoing Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

